Aqueon 100% Silicone Aquarium Sealant
100% Silicone Aquarium Sealant. Our sealant is easy to apply and waterproof to stop leaks. The high strength silicone creates a permanent seal that will not crack or shrink and is non-toxic making it perfect for use on all aquariums. For standard aquariums use clear and black seal aquariums use black sealant.